Revolving chair.



C. J. TRAVERS.

REVOLVING CHAIR.

P dented Oct. 5, 1915.

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REVOLVING CHAIR.

Specification of Letters Patent.

Patented Oct. 5, 1915.

Application flied July 9, 1914. Serial No. 849,925.

To all whom it may concern:

Be it known that I, G -rAnLns J. TRAVERS, a citizen of the United States, residing at Oak Park, in the county of Cook and State of Illinois, have invented new and useful Improvements in Revolving Chairs, of which the following is a specification.

This invention relates to improvements in revolving chairs but more particularly to that part thereof commonly known as the chair-iron, such being the mechanism usually employed for supporting the chairseat upon the base in a revoluble and ad justable manner.

The principal objects of my invention are to so construct a simple, durable and compact chair-iron asthat the adjusting-stand ard or screw will be automatically and positively locked at any elevation, may be readily and conveniently unlocked by the application of the toe of the operators foot, and, therefore, without the necessity of stooping and manipulating the usually em ployed locking-device, and, when so unlocked, may be readjusted to any elevation merely by revolutions of the chair-seat instead of through the instrumentality of the usual hand-wheel.

Other objects and advantages of the invention will hereinafter appear, and the novel features of the invention will be particularly pointed out in the appended claims.

Referring to the drawings: Figure 1 is an elevation of a chair-iron constructed in accordance with my invention. Fig. 2 is avertical longitudinal sectional view of the same. F ig. 3 is a plan view of Figs. 1 and 2, the cover-plate being removed.

Likenumerals of reference indicate like parts in all the figures of the drawing.

For convenience alone, I have illustrated my invention in connection with the wellknown cast metal chainiron base 5, but it will be understood that the invention as hereinafter described may be used in connection with any other form or construction of base, the latter, in this instance, being immaterial as it forms no part of my present invention. The, base 5, as will appear,iis so shaped as to receive the usual legs (not shown) and, at its upper end, has theflange G, for the purpose of overlapping and being secured to said legs. The base is further provided with the vertical bore 7, extending throughout the same.

Mounted to revolve within the bore of the base, is a sleeve 10, longitudinally bored, as at 11, throughout its length, and prov ded at its upper end with a flange 12, de slgned to rest and rotate upon the flange 6 of the base. The upper end of the bore 11 is reduced to form a bearing 13, and the lower end thereof is likewise reduced, as at 14, and internally threaded to receive the threads of the vertically adjustable standard or screw 20. In addition to having its lower portion threaded, the adjusting-stand ard or screw is further provided with a longitudinal groove 21 at one side and extending practically throughout its length.

In order to retain the sleeve within the bore of the base, when the chair as a whole is lifted about, I may employ a screw 15, threading the same in an aperture formed in the bottomof the sleeve at one side of the bore, The head 15 of the screw overlaps the bottom of the casting, so that the sleeve and base are secured together. In order to provide means whereby the parts may be separated when desired, I may cut away one side of the head of the screw, as at 15. By rotating the screw so as to bring the cut away portion under the bottom of the cast ing 5, the screw will no longer retain the parts together, as will be obvious.

Eccentrically located in connection with and at each side of the adjusting-standard or screw 20, and extending from the upper side of the flange 1.2 of the sleeve, is a stud 25. Immediately in rear of the studs 25 are similar studs 26, the latter engaging the curved extremities 27, of a bowed spring 28.

3O designates a somewhat triangularlyshaped locking-plate. At its two rear corners, at what would be the base of the triso that as said plate is rocked against the tension of the spring 28, said studs alternately become the fulcrum of the plate; that is to say, when the plate is rocked laterally in one directionfor instance, to the right' the stud at the right becomes the fulcrum and the opposite or companion hook disen,

gages from the left-hand stud, and vice:

versa. In advance of each stud 25, the plate 30 is provided with a curved guide 30*,

which in the present instance, is formed by curving the edges of the plate concentric with their hooks 31 and 32, and, hence, also, with their fulcrum-studs 25. Thus, as will be apparent, as the plate is swung, for instance, to the right, the stud at that side will, as previously stated, become the fulcrum therefor, while the curved guide 3O (formed by the edge of the plate at the opposite side), will ride against the side of the opposite or left stud 25. Of course, a movement of the plate to the left will cause a reversal of the Operation. Thus it will be seen that one stud 25 will serve as the fulcrum of the plate, while its companion stud 25, will coact with the edge of the plate opposite and serve as a guide. At its front, or what would be the apex of the angle, the plate is elongated to form a projecting tongue or handle 35, the same being shaped as may be desired and for a purpose hereinafter apparent. The locking-plate is furthermore provided with an elongated opening 33, the game being somewhat larger than and receiving the adjustingstandard or screw 20. At the rear edge of the opening 33 the locking-plate is formed with a lock ing-lug 34, the same being normally forced intolocking engagement with the groove 21 of the adjusting-standard or screw by the bowed spring 28. This completes the construction of the iron with the exception of the concaved housing or cover 40, which surmounts the whole. This cover 40 is retained in position by screws 41, passing through the same and into the flange 12 of the sleeve 10, and at one side is'provided with a slot 42, through'which the projecting tongue or handle 35 extends to a point where it is within easy access of the foot of the operator.

Taking the parts as shown in the drawings, it will be apparent that the sleeve 10 and all the parts carried thereby may be freely turned in the base, as when the chair revolves or swivels. hen, however, it is desired to elevate or lower the chair-seat,

all the operator has to do is to move the locking-plate to either side a. suflicient distance to disengage the locking-lug 34 thereof from the groove 21 of the adjusting standard or screw 20. lVhen thus unlocked, it will be obvious that the seat of the chair may be revolved in either direction and, the screw operating in the threads of the sleeve, will either elevate or lower the chair-seat in accordance with the direction of rotation, the sleeve in the meantime being held against rotation. When the desired point of adjustment of the chair-seat has been reached, it is simply necessary to release the handle 35 of the locking-plate, when the spring 28 returns the plate 30 to its normal or locked position. The locking-plate may be operated by hand, but is preferably, for

has to do is to place his toe on the concaved cover 40 at either side of the handle 35 in accordance with direction of rotation of the chair-seat. That is to say, if it is desired to lower the seat and hence revolve the standard or screw to the left, the toe must be applied to the coverat the left side of the handle, and vice versa. The foot being in position, the seat is rotated and with it rotate all the parts of the iron, with theeX-' ception of the base, until the handle 35 of the locking-plate arrives against the foot or toe of the operator, when the continuation of this rotation of the parts, the lockingplate now being prevented from further movement, would cause the latter to fulcrum chair-seatrevolved to the right, then the hook 31 becomes the fulcrum-hook and the hook 32 disengages from its stud. In either instance, however, when the seathas been properly adjusted, by simply releasing the handle the locking-plate reengagesthe adjusting-standard or screw and the seat can be freely revolved without danger of changing the adjustment. The employment of the two hooks or double fulcrums is principally desirable for the fact that the foot may then be conveniently employed to operate the locking-plate in the manner described, whereby the sleeve is held stationary :and

the adjusting-standard or screw works up or down in the same. v

By this construction I avoid the necessity of the operator assuming a stooping posture for the purpose of unlocking the adjustingstandard or screw or for turning the chair over to find the locking-device, but to the contrary, all the operator has to do is to apply the toe of his sho-e to one side or the other of the handle of the locking plate and revolve the chair-seat to the desired elevation.

Having thus'fully described my invention, what I claim, is:

l. The combination, in a chair-iron, of bored hub or base, a sleeve revolubly mounted therein, the latter being bored'and threaded and provided at its upper end with an overlapping flange, an adjusting-standard or screw mounted in the sleeve and having threads at its lower end engaging those of the sleeve and provided with a longitudinal groove, a pair of fulcrum-studs rising from the flange of the sleeve and arranged eccentrically with the opening therein, a substantially triangular-shaped plate mounted on the flange of the sleeve, said plate having an elongated opening to receive the adjusting-standard or screw and at one side formed with a lug for engaging the groove of the adjusting-screw or standard, a handle or tongue at one side of the plate and projecting beyond the flange, hooks at the remaining corners of the plate reinovably engaging the eccentrically located studs, studs back of the, plate upon the flange, a bowed spring secured at its ends to said studs and between the same having its bowed portion bearing against the rear edge of the locking-plate, and a concaved cap or cover secured to the flange and provided with a slot at one side through and beyond which the tongue or handle projects. 7

2. The combination, in a chair-iron, of a bored hub or base, a sleeve revolubly mounted therein, the latter being bored and threaded and provided at its upper end with an overlapping flange, an adjusting-standard or screw mounted in the sleeve and having threads at its lower end engaging those of the sleeve and provided with a longitudinal groove, a pair of fulcrum-studs rising from the flange of the sleeve and arranged eccentrically with the opening there in, a substantially triangular-shaped plate mounted on the flange of the sleeve, said plate having an elongated opening to receive the adjusting-standard or screw and at one side formed with'a lug for engaging the groove of the adjusting-screw or standard, a handle or tongue at one side ofthe plate and projecting beyond the flange, hooks at the remaining corners of the plate 'removably engaging the eccentrically located fulcrum-studs, means for yieldingly pressing said plate forward, whereby its lugs are normally retained in locking engagement with the groove of the adjusting standard or screw, and a concaved cap or cover secured to the flange of the sleeve and having a. slot through and beyond which the handle or tongue of the locking-plate projects.

3. The combination, in a chair-iron, of a bored hub or base, a bored-sleeve revolubly supported thereby and having opposite studs rising therefrom and arranged eccentrically with relation to the bore thereof, an adjusting-standard or screw longitudinally grooved and threaded in the sleeve, a lockingplate mounted for horizontal movement upon the sleeve and having a lug for engaging the adjusting standard or screw and opposite openings for loosely engaging the studs of the sleeve, and a spring for influencing the lockingplate whereby its lug is normally in engagement with the groove of the adjusting-standard or screw.

4. The combination, in a chair-iron, of a bored hub or base, a bored sleeve revolubly supported thereby and having a flange at one end provided with a pair of fulcrumstuds arranged opposite each other and eccentric with the bore of the sleeve, a longitudinally grooved adjusting-standard or screw threaded in the sleeve, a horizontally disposed vibratory locking-plate mounted for movement upon the flange of the sleeve and provided with a locking lug and at each side thereof with hooks for temporarily engaging the fulcrum-studs, and means for yieldingly influencing the locking-plate whereby its lug is normally in engagement with the groove of the adjusting-standard or screw and its hooks in engagement mith the fulcrum studs.

5. The combination, in a chair-iron, of a bored hub or base, a bored sleeve revolubly supported thereby, an adjustingstandard or screw longitudinally grooved and threaded in the sleeve, a pair of fulcrum-studs arranged at opposite sides of the standard or screw and upon the sleeve, a vibratory locking-plate having opposite stud engaging openings and in advance thereof: having curved guides, each concentric with the opposite stud, and with an elongated opening receiving the standard or screw, and at one side having a lug for engaging the standard or screw, and means for influencing the plate whereby its lug is normally in engagement with the groove of the standard or screw.

6, The combination, in a chair-iron, of a bored hub or base, a bored sleeve revolubly supported thereby, an adjusting-standard or screw longitudinally grooved and threaded in the sleeve, a pair of fulcrum-studs arranged at opposite sides of the standard or screw and upon the sleeve, a vibratory locking-plate having opposite hooks for temporarily engaging said studs and in advance thereof having curved guide-edges, each concentric with the opposite stud, and with an elongated opening receiving the standard or screw, and at one side having a lug for engaging the groove of the standard or screw, and means for influencing the plate whereby its lug is normally in engagement with the groove of the standard or screw.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

CHARLES J. TRAVERS.

Witnesses:

ZELLA D. BODINE, B. O. DETRIGK.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

